EJB - 何时使用远程和或本地接口

Java
// 远程接口
public interface RemoteCalculator {
    int add(int a, int b);
}
// 远程EJB
@Stateless
@Remote(RemoteCalculator.class)
public class RemoteCalculatorBean implements RemoteCalculator {
    public int add(int a, int b) {
        return a + b;
    }
}
// 本地接口
public interface LocalCalculator {
    int subtract(int a, int b);
}
// 本地EJB
@Stateless
@Local(LocalCalculator.class)
public class LocalCalculatorBean implements LocalCalculator {
    public int subtract(int a, int b) {
        return a - b;
    }
}
// 客户端
public class Client {
    public static void mAIn(String[] args) {
        // 使用远程接口
        RemoteCalculator remoteCalculator = lookupRemoteCalculator();
        int sum = remoteCalculator.add(5, 3);
        System.out.println("Sum: " + sum);
        // 使用本地接口
        LocalCalculator localCalculator = lookupLocalCalculator();
        int difference = localCalculator.subtract(5, 3);
        System.out.println("Difference: " + difference);
    }
    private static RemoteCalculator lookupRemoteCalculator() {
        // 远程接口查找和创建逻辑
        // ...
    }
    private static LocalCalculator lookupLocalCalculator() {
        // 本地接口查找和创建逻辑
        // ...
    }
}